Use BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED for system props split (2)

http://ag/1955051 is already submitted for the same purpose, but this
was missed from it.

Test: building succeeded and tested with sailfish
Bug: 34116668
Change-Id: I662b68d5b07e65bfdcf41fcd0782640582246318
diff --git a/core/main.mk b/core/main.mk
index 0e4af4f..e8a35e4 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -276,7 +276,7 @@
   ro.product.first_api_level=$(PRODUCT_SHIPPING_API_LEVEL)
 endif
 
-ifneq ($(ENABLE_TREBLE), true)
+ifneq ($(BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED), true)
   ADDITIONAL_BUILD_PROPERTIES += $(PRODUCT_PROPERTY_OVERRIDES)
 else
   ifndef BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE